I've only climbed in these twice in a gym and for a pretty strenuous Joshua Tree tip.
The shoes inspire confidence in slab climbing. They work great just smearing on a tip-toe or edging.
They have a VERY deep heel. So deep that it caused blisters up on my Achilles tendon. I did a couple of heel-hooks, and they work great. Very secure on the rock, but kinda vague feeling.
I had to do the buy/return thing three times to find the right size. These were a full euro size smaller than my last 5.10s. So far, these have not stretched too much and are holding up great, even with some pretty long walk-offs.
These are not the best crack shoes. There is no protection for the tops of the toes and I suffered with every jam.